org.javimmutable.collections.list.ListCollisionSet Maven / Gradle / Ivy

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// Burton Computer Corporation
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package org.javimmutable.collections.list;

import org.javimmutable.collections.Proc1;
import org.javimmutable.collections.Proc1Throws;
import org.javimmutable.collections.Sum1;
import org.javimmutable.collections.Sum1Throws;
import org.javimmutable.collections.common.CollisionSet;
import org.javimmutable.collections.iterators.GenericIterator;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;

public class ListCollisionSet
    implements CollisionSet
{
    @SuppressWarnings("rawtypes")
    private static final ListCollisionSet INSTANCE = new ListCollisionSet();

    private ListCollisionSet()
    {
    }

    @SuppressWarnings("unchecked")
    @Nonnull
    public static  ListCollisionSet instance()
    {
        return INSTANCE;
    }

    @SuppressWarnings("unchecked")
    @Nonnull
    private AbstractNode root(@Nonnull Node node)
    {
        return (AbstractNode)node;
    }

    @Nonnull
    @Override
    public Node empty()
    {
        return EmptyNode.instance();
    }

    @Nonnull
    @Override
    public Node single(@Nonnull T value)
    {
        return new OneValueNode<>(value);
    }

    @Override
    public int size(@Nonnull Node node)
    {
        return root(node).size();
    }

    @Override
    public boolean contains(@Nonnull Node node,
                            @Nonnull T value)
    {
        for (T v : root(node)) {
            if (v.equals(value)) {
                return true;
            }
        }
        return false;
    }

    @Nonnull
    @Override
    public Node insert(@Nonnull Node node,
                       @Nonnull T value)
    {
        final AbstractNode root = root(node);
        int i = 0;
        for (T v : root) {
            if (v.equals(value)) {
                return root;
            }
            i += 1;
        }
        return root.append(value);
    }

    @Nonnull
    @Override
    public Node delete(@Nonnull Node node,
                       @Nonnull T value)
    {
        final AbstractNode root = root(node);
        int i = 0;
        for (T v : root) {
            if (v.equals(value)) {
                return root.delete(i);
            }
            i += 1;
        }
        return root;
    }

    @Nullable
    @Override
    public GenericIterator.State iterateOverRange(@Nonnull Node node,
                                                     @Nullable GenericIterator.State parent,
                                                     int offset,
                                                     int limit)
    {
        return root(node).iterateOverRange(parent, offset, limit);
    }

    @Override
    public void forEach(@Nonnull Node node,
                        @Nonnull Proc1 proc)
    {
        root(node).forEach(proc::apply);
    }

    @Override
    public  void forEachThrows(@Nonnull Node node,
                                                    @Nonnull Proc1Throws proc)
        throws E
    {
        root(node).forEachThrows(proc);
    }

    @Override
    public  R reduce(@Nonnull Node node,
                        R sum,
                        @Nonnull Sum1 proc)
    {
        return root(node).reduce(sum, proc::apply);
    }

    @Override
    public  R reduceThrows(@Nonnull Node node,
                                                   R sum,
                                                   @Nonnull Sum1Throws proc)
        throws E
    {
        return root(node).reduceThrows(sum, proc);
    }
}